Field help: (2018) Relationship to the child This text refers to the Steuererklärung 2018. You can find the version for the Steuererklärung 2025 at: (2025): Relationship to the child Enter here the child's relationship to another person (father or mother).A relationship to the child within the meaning of the Income Tax Act only exists if it is a natural child, an adopted or a foster child.